[P-EM20] Study of coupling processes in solar-terrestrial system

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[PEM20-03] Atmosphere-ionosphere variability caused by magnetic storms:GAIA simulation

*Yasunobu Miyoshi¹, Akimasa Yoshikawa¹, Keiichiro Fukazawa², Aoi Nakamizo³, Hidekatsu Jin³, Chihiro Tao³, Hitoshi Fujiwara⁴ (1.Faculty of Science, Kyushu University, 2.Research Institute for Humanity and Nature, 3.NICT, 4.Faculty of Science and Technology, Seikei University)

Keywords:

magnetosphere-ionosphere coupling process,atmosphere-ionosphere coupling process,numerical simulation

The upper atmosphere is strongly influenced not only by the lower atmosphere but also the magnetosphere. Our group has been conducting simulation studies using GAIA (Ground-to-topside model of the Atmosphere and Ionosphere for Aeronomy) model to investigate magnetic storm the upper atmosphere. In the current GAIA, the electric field at high latitudes is estimated by the Weimer’s empirical model, and the energy precipitation from the magnetosphere is parameterized based on the Kp index. These estimation methods, however, have many limitations. to evaluate the magnetosphere-ionosphere coupling (M-I coupling) process. Therefore, in order to evaluate the magnetosphere-ionosphere coupling process more precisely, we plan to use the electric field distribution at high latitudes and the energy precipitation from the magnetosphere simulated by a global MHD simulation model, REPPU (REProduce Plasma Universe model). In the future, we plan to develop a new model, GAIA-REPPU coupled model to obtain more accurate estimates of the M-I coupling process. In this presentation, we introduce the present status of the GAIA-REPPU coupled model.